Physics, Books a la Carte Edition (5th Edition)
5th Edition
ISBN: 9780134020853
Author: James S. Walker
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 21, Problem 20PCE
BIO Resistance and Current in the Human Finger The interior of the human body has an electrical resistivity of 0.15 Ω.m. (a) Estimate the resistance for current flowing the length of your index finger. (For this calculation, ignore the much higher resistivity of your skin.) (b) Your muscles will contract when they carry a current greater than 15 mA. What voltage is required to produce this current through your finger?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
6. Is the true pendulum an example of SHM? Explain.
In the circuit shown below & = 66.0 V, R5
= 4.00, R3 = 2.00, R₂ = 2.20 ₪, I5 = 11.41 A, I₁ = 10.17 A, and i̟ = 6.88 A. Find the current through R2 and R3, and the values of the resistors R₁ and R. (Due to the nature of this
problem, do not use rounded intermediate values-including answers submitted in WebAssign-in your calculations.)
12
= 8.12
8.12
13
R₁₁ =
RA
=
A
Based on the known variables, which two junctions should you consider to find the current I3? A
6.9965
61.5123
Ω
Which loop will give you an equation with just R4 as the unknown? Did you follow the sign convention for the potential difference across each element in the loop?
R₁
www
11
R₂
www
R4
www
14
8
15
www
R5
www
R3
A car traveling at 42 km/h hits a bridge abutment. A passenger in the car moves forward a distance of 53 cm (with respect to the road)
while being brought to rest by an inflated air bag. What magnitude of force (assumed constant) acts on the passenger's upper torso,
which has a mass of 43 kg?
Number i
Units
Chapter 21 Solutions
Physics, Books a la Carte Edition (5th Edition)
Ch. 21.1 - Enhance Your Understanding 1. The following...Ch. 21.2 - Enhance Your Understanding 2. If the voltage and...Ch. 21.3 - Enhance Your Understanding 3. In the following...Ch. 21.4 - The two circuits shown in Figure 21-17 have...Ch. 21.5 - Prob. 5EYUCh. 21.6 - Do two capacitors give a larger equivalent...Ch. 21.7 - Give a symbolic expression for the current that...Ch. 21 - Your body is composed of electric charges. Does it...Ch. 21 - Suppose you charge a comb by rubbing it through...Ch. 21 - An electron moving through a wire has an average...
Ch. 21 - Are car headlights connected in series or...Ch. 21 - Is it possible to connect a group of resistors of...Ch. 21 - What physical quantity do resistors connected in...Ch. 21 - What physical quantity do resistors connected in...Ch. 21 - Explain how electrical devices can begin operating...Ch. 21 - Explain the difference between resistivity and...Ch. 21 - Explain why birds can roost on high-voltage wires...Ch. 21 - Consider the circuit shown in Figure 21-36, in...Ch. 21 - A flashlight bulb carries a current of 0.38 A for...Ch. 21 - Predict/Calculate A car battery does 360 J of work...Ch. 21 - Highly sensitive ammeters can measure currents as...Ch. 21 - A television set connected to a 120-V outlet...Ch. 21 - BIO Pacemaker Batteries Pacemakers designed for...Ch. 21 - A conducting wire is quadrupled in length and...Ch. 21 - Figure 21-37 shows a plot of current versus...Ch. 21 - Predict/Explain Current-versus-voltage plots for...Ch. 21 - Prob. 9PCECh. 21 - When a potential difference of 12 V is applied to...Ch. 21 - Prob. 11PCECh. 21 - Prob. 12PCECh. 21 - Transcranial Direct-Current Stimulation In a tDCS...Ch. 21 - The four conducting cylinders shown in Figure...Ch. 21 - Predict/Calculate A bird lands on a bare copper...Ch. 21 - Prob. 16PCECh. 21 - Predict/Calculate BIO Current Through a Cell...Ch. 21 - Prob. 18PCECh. 21 - Prob. 19PCECh. 21 - BIO Resistance and Current in the Human Finger The...Ch. 21 - If a potential difference V is maintained between...Ch. 21 - Light A has four times the power rating of light B...Ch. 21 - Two lightbulbs operate on the same potential...Ch. 21 - Problems and Conceptual Exercises Section 21-3...Ch. 21 - A 65-V generator supplies 4.8 kW of power. How...Ch. 21 - A portable CD player operates with a current of 18...Ch. 21 - Find the power dissipated in a 22- electric heater...Ch. 21 - The current in a 120-V reading lamp is 2.6 A. If...Ch. 21 - Circuit A in a house has a voltage of 208 V and is...Ch. 21 - Predict/Calculate A 65-W lightbulb operates on a...Ch. 21 - Rating Car Batteries Car batteries are rated by...Ch. 21 - Predict/Explain A dozen identical lightbulbs are...Ch. 21 - A circuit consists of three resistors, R1 R2 R3,...Ch. 21 - Predict/Explain Two resistors are connected in...Ch. 21 - What is the minimum number of 88- resistors that...Ch. 21 - Find the equivalent resistance between points A...Ch. 21 - A 9.00-V battery is connected across the terminals...Ch. 21 - Holiday Lights In a string of holiday lights, 50...Ch. 21 - Your toaster has a power cord with a resistance of...Ch. 21 - Prob. 40PCECh. 21 - Predict/Calculate Three resistors, 11, 53 , and R,...Ch. 21 - A circuit consists of a battery connected to three...Ch. 21 - Predict/Calculate Three resistors, 22 , 67 , and...Ch. 21 - Prob. 44PCECh. 21 - The equivalent resistance between points A and B...Ch. 21 - Find the equivalent resistance between points A...Ch. 21 - How many 23-W lightbulbs can be connected in...Ch. 21 - The circuit in Figure 21-43 includes a battery...Ch. 21 - Predict/Calculate A 12-V battery is connected to...Ch. 21 - Predict/Calculate The terminals A and B in Figure...Ch. 21 - Predict/Calculate Suppose the battery in Figure...Ch. 21 - Predict/Calculate The current flowing through the...Ch. 21 - Predict/Calculate Four identical resistors are...Ch. 21 - Find the magnitude and direction (clockwise or...Ch. 21 - Predict/Calculate Suppose the polarity of the...Ch. 21 - Predict/Calculate It is given that point A in...Ch. 21 - Consider the circuit shown in Figure 21-47. Find...Ch. 21 - Suppose point A is grounded (V = 0) in Figure...Ch. 21 - Predict/Calculate (a) Find the current in each...Ch. 21 - Two batteries and three resistors are connected as...Ch. 21 - Two capacitors, C1 = C and C2 = 2C, are connected...Ch. 21 - Predict/Explain Two capacitors are connected in...Ch. 21 - Predict/Explain Two capacitors are connected in...Ch. 21 - A 252-F capacitor is connected in series with a...Ch. 21 - A 36-F capacitor is connected in parallel with an...Ch. 21 - Find the equivalent capacitance between points A...Ch. 21 - A 15-V battery is connected to three capacitors in...Ch. 21 - Three different circuits, each containing a switch...Ch. 21 - Terminals A and B in Figure 21-50 are connected to...Ch. 21 - Predict/Calculate You would like to add a second...Ch. 21 - Two capacitors, one 7.5 F and the other 15 F, are...Ch. 21 - The equivalent capacitance of the capacitors shown...Ch. 21 - With the switch in position A, the 11.2-F...Ch. 21 - The switch on an RC circuit is closed at t = 0....Ch. 21 - The capacitor in an RC circuit (R = 120 , C = 45...Ch. 21 - Three RC circuits have the emf, resistance, and...Ch. 21 - Consider an RC circuit with = 12.0 V, R = 195 ,...Ch. 21 - The resistor in an RC circuit has a resistance of...Ch. 21 - A flash unit for a camera has a capacitance of...Ch. 21 - Figure 21-54 shows a simplified circuit for a...Ch. 21 - Nerve Impulse Propagation The speed with which...Ch. 21 - Predict/Calculate Consider the RC circuit shown in...Ch. 21 - CE Consider the circuit shown in Figure 21-56, in...Ch. 21 - CE Predict/Explain (a) Referring to Problem 83 and...Ch. 21 - CE Consider the circuit shown in Figure 21-57, in...Ch. 21 - CE Predict/Explain (a) When the switch is closed...Ch. 21 - Suppose that points A and B in Figure 21-41 are...Ch. 21 - CE The circuit shown in Figure 21-58 shows a...Ch. 21 - CE The three circuits shown in Figure 21-59 have...Ch. 21 - Electrical Safety Codes For safety reasons,...Ch. 21 - A portable CD player uses a current of 7.5 mA at a...Ch. 21 - An electrical heating coil is immersed in 6.6 kg...Ch. 21 - Predict/Calculate Consider the circuit shown in...Ch. 21 - Prob. 94GPCh. 21 - BIO Pacemaker Pulses A pacemaker sends a pulse to...Ch. 21 - Three resistors (R,12R,2R) are connected to a...Ch. 21 - Predict/Calculate Suppose we connect a 12.0-V...Ch. 21 - National Electric Code In the United States, the...Ch. 21 - Solar Panel Power The current-versus-voltage plot...Ch. 21 - Predict/Calculate A 15.0-V battery is connected to...Ch. 21 - When two resistors, R1 and R2, are connected in...Ch. 21 - The circuit shown in Figure 21-62 is known as a...Ch. 21 - BIO Footwear Safety The American National...Ch. 21 - BIO Footwear Safety The American National...Ch. 21 - BIO Footwear Safety The American National...Ch. 21 - The standard specifies that footwear should be...Ch. 21 - Referring to Example 21-13 Suppose the three...Ch. 21 - Referring to Example 21-13 Suppose R1 = R2 = 225 ...Ch. 21 - Predict/Calculate Referring to Example 21-18...Ch. 21 - Predict/Calculate Referring to Example 21-18...
Additional Science Textbook Solutions
Find more solutions based on key concepts
In the following diagram, the white spheres represent hydrogen atoms and the blue Sphere represent the nitrogen...
Chemistry: The Central Science (14th Edition)
27. Consider the reaction.
Express the rate of the reaction in terms of the change in concentration of each of...
Chemistry: Structure and Properties (2nd Edition)
1.3 Obtain a bottle of multivitamins and read the list of ingredients. What are four chemicals from the list?
Chemistry: An Introduction to General, Organic, and Biological Chemistry (13th Edition)
Why is an endospore called a resting structure? Of what advantage is an endospore to a bacterial cell?
Microbiology: An Introduction
Level 2: Application/Analysis 4. Nitrifying bactcria participatc in the nitrogen cycle mainly by (A) converting...
Campbell Biology (11th Edition)
With the initial appearance of the feature we call Now Solve This, a short introduction is in order. The featur...
Concepts of Genetics (12th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Three resistors R₁ = 88.1 Q, R2 = 19.9 £2, R3 = 70.00, and two batteries & ₁ = 40.0 V, and ε2 = 353 V are connected as shown in the diagram below. R₁ www E₁ E2 R₂ ww ww R3 (a) What current flows through R₁, R2, and R3? 11 = 0.454 Did you choose directions for each of the three currents? Given that you have three unknowns to solve for, how many equations, at the least, will you need? A 12 = 1.759 Did you choose directions for each of the three currents? Given that you have three unknowns to solve for, how many equations, at the least, will you need? A 13 2.213 = Did you choose directions for each of the three currents? Given that you have three unknowns to solve for, how many equations, at the least, will you need? A (b) What is the absolute value of the potential difference across R1, R2, and R3? |AVR1 = 40.0 How is the potential difference related to the current and the resistance? V |AVR2 = 35.0 How is the potential difference related to the current and the resistance? V |AVR3 =…arrow_forwardIn the attached image is the circuit for what the net resistance of the circuit connected to the battery? Each resistance in the circuit is equal to 14.00 kΩ. Thanks.arrow_forwardDetermine the equivalent capacitance for the group of capacitors in the drawing. Assume that all capacitors be the same where C = 24.0 µF. Thank you.arrow_forward
- In the figure below, what is the net resistance of the circuit connected to the battery? Assume that all resistances in the circuit is equal to 14.00 kΩ. Thank you.arrow_forwardDue to the nature of this problem, do not use rounded intermediate values-including answers submitted in WebAssign-in your calculations. 3 4 Find the currents flowing in the circuit in the figure below. (Assume the resistances are R₁ =6, R₂ = 20, R₂ = 10 N, R₁ = 8, r₁ = 0.75 0, r2=0.50, 3 × A × A I, = 3.78 12 13 = 2.28 = 1.5 × A R₁ b a R₁₂ w C 1, 12 13 R₂ E3 12 V E₁ 18 V g Ez 3.0 V 12 Ea شرة R₁ e 24 V d = 0.25 0, and 4 = 0.5 0.)arrow_forwardIn the circuit shown below Ɛ = 66.0 V, R5 = 4.00 £2, R3 = 2.00 N, R₂ = 2.20 N, I5 = 11.41 A, I = 10.17 A, and d I₁ = 6.88 A. Find the current through R2 and R3, and the values of the resistors R₁ and R. (Due to the nature of this problem, do not use rounded intermediate values—including answers submitted in WebAssign-in your calculations.) 12 = 8.12 A RA = -1.24 Based on the known variables, which two junctions should you consider to find the current I3? A 9.59 Which loop will give you an equation with just R₁ as the unknown? Did you follow the sign convention for the potential difference across each element in the loop? 6.49 Which loop will give you an equation with just R as the unknown? Did you follow the sign convention for the potential difference across each element in the loop? N R₁ ww R₂ www R4 ww 14 15 www R5 www R3arrow_forward
- Certain types of particle detectors can be used to reconstruct the tracks left by unstable, fast-moving sub-atomic particles. Assume that a track with a length of L=2.97 mm in the laboratory frame of reference has been observed. Further assume that you determined from other detector data that the particle moved at a speed of L=0.910 ⚫ c, also in the laboratory frame of reference. c denotes the speed of light in vacuum. What proper lifetime would you determine for this particle from the data given? T= 4.0 Sarrow_forwardgenerated worksheetarrow_forwardWhile cruising down University Boulevard you are stopped by a cop who states that you ran a red traffic light. Because you don't want to pay the stiff fine, you are attempting a physics defense. You claim that due to the relativistic Doppler effect, the red color of the light λ=616 nm appeared green '=531 nm to you. The cop makes a quick calculation of his own and rejects your defense. How fast, in terms of your speed u divided by the speed of light in vacuum c, would you have to drive to justify your claim? Note that the speed u is taken to be a positive quantity. U 4.0 Carrow_forward
- 220 V is supplied to 800 primary turns of an autotransformer. What will the outputvoltage be across 200 secondary turns? 2. A filament transformer has a turns ratio of 1:20. What current must be supplied to theprimary windings if 5 A is required by the filament? 3. The filament transformer in the previous question is supplied with 150 V to theprimary side. What is the secondary voltage? 4. 440 V is supplied to 1000 primary turns of an autotransformer. If the desired outputvoltage is 100 V how many secondary turns must be tapped?arrow_forward220 volts is supplied across 1200 winding of the primary coil of the autotransformer.If 1650 windings are tapped, what voltage will be supplied to the primary coil of thehigh-voltage transformer?2. A kVp meter reads 86 kVp and the turns ratio of the high-voltage step-up transformeris 1200. What is the true voltage across the meter?3. The supply voltage from the autotransformer to the filament transformer is 60 volts. If theturns ratio of the filament transformer is 1/12, what is the filament voltage?4. If the current in the primary side of the filament transformer in question 3 were 0.5 A,what would be the filament current?5. The supply to a high-voltage step-up transformer with a turns ratio of 550 is 190 volts.What is the voltage across the x-ray tube?arrow_forward220 V is supplied to 800 primary turns of an autotransformer. What will the outputvoltage be across 200 secondary turns? 2. A filament transformer has a turns ratio of 1:20. What current must be supplied to theprimary windings if 5 A is required by the filament? 3. The filament transformer in the previous question is supplied with 150 V to theprimary side. What is the secondary voltage? 4. 440 V is supplied to 1000 primary turns of an autotransformer. If the desired outputvoltage is 100 V how many secondary turns must be tapped?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
College Physics
Physics
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:OpenStax College
Physics for Scientists and Engineers
Physics
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...
Physics
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...
Physics
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
How To Solve Any Resistors In Series and Parallel Combination Circuit Problems in Physics; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=eFlJy0cPbsY;License: Standard YouTube License, CC-BY